When you practice zazen you should not try to attain anything. You should just sit in the complete calmness of your mind and not rely on anything. Just keep your body straight without leaning over or against something. To keep your body straight means not to rely on anything. In this way, physically and mentally, you will obtain complete calmness. But to rely on something or to try to do something in zazen is dualistic and not complete calmness.
